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Hemodynamic profile of acute circulatory failure based on ultrasound. CI: cardiac index; CO: cardiac output; IVC: inferior vena cava; LVOT: left ventricle outflow tract; PAOP: pulmonary artery occlusion pressure; PLR: passive leg raising; RV: right ventricle; RVOT: right ventricle outflow tract; VTI: velocity–time integral.
